README: Add October 2024 permalinks

Author: gibson042

README.md

@@ -18,7 +18,7 @@ A TC39 proposal for immutable ArrayBuffers.
 
 ## Presentation history
 
-[Oct 2024 tc39 Slides Keynote](https://github.com/Agoric/tc39-proposal-immutable-arraybuffer/blob/main/immu-arrayBuffers.key) [pdf](https://github.com/Agoric/tc39-proposal-immutable-arraybuffer/blob/main/immu-arrayBuffers.pdf)
+- October 2024 ([slides.key](https://github.com/tc39/tc39-proposal-immutable-arraybuffer/blob/d4fac6c6602c5fa5a1d3769242f042758dc43db6/immu-arrayBuffers.key), [slides.pdf](https://github.com/tc39/tc39-proposal-immutable-arraybuffer/blob/d4fac6c6602c5fa5a1d3769242f042758dc43db6/immu-arrayBuffers.pdf), [video](https://www.youtube.com/watch?v=CP_5Yo9h84k))
 
 ## Background